Soap bar with a cavity design



FIG. 1 is a perspective view of the soap bar with a cavity design.

FIG. 2 is top view.

FIG. 3 is a cross sectional view taken along line 3-3 in FIG. 1; and,

FIG. 4 is a cross sectional view taken along line 4-4 in FIG. 1.

The broken lines illustrating the soap bar are shown for environment and form no part of the claimed design. 

The ornamental design for the soap bar with a cavity design, as shown and described. 